fast click ingnored

It has been discussed on this list before how rapid mouse clicks will
not trigger a mouseUp handler twice in quick succession. To get around
this, I tend to put a general mouseDoubleUp in my main stack script
that checks if the target has a mouseUp and if so calls it.
However, the reason for this email is that I have noticed a peculiarity
which I would like people on other systems to confirm or deny. If I
click twice AT THE SAME POINT within about 5 seconds, the second click
is ignored. If I move the mouse slightly, the second click gets
recognized as fast as I can click.
I am using Mac OS X 10.3.4 and Rev 2.2.1 as well as the latest beta.
Cheers,
Sarah